To address this issue, the graph of the problem is embedded into D'WAVE's graph following a procedure called minor-embedding [1]}. In this process, some variables of the problem graph are represented by a set of physical qubits. These qubits conform a chain that must act as a single qubit and so return the same value at the end of the annealing process. Towards this end, the chain strength, i.e. the coupling weight assigned to consecutive qubits in the chain, have to be set. Finding a good value of the chain strength is crucial, because if its small, the chains will break. Otherwise, if the chain strength is to large, each chain will act like a separate entity, emulating independent variables that do not interact with each other [2]}.
